JP2006221718A - Disk playback apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make easy tilt adjustment of a pickup feeding base member guiding horizontally movement of the pickup reading recording information from an information recording surface of a disk. <P>SOLUTION: The apparatus has the pickup moved in a radial direction of the disk opposing to a disk surface placed on a turn table and reading out recorded information, the pickup feeding base member guiding horizontally movement of the pickup, and an energizing member energizing the pickup feeding base member in one direction, the pickup feeding base member is held at a reproduction base with three points, two points of a height fixed reference point and a first height adjusting point are provided at one end side of the pickup feeding base member, and one point of a second height adjusting point is provided at the other end side of the pickup feeding base member. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk reproducing apparatus, and more particularly to a disk reproducing apparatus that facilitates the tilt adjustment of a pickup feed base member that horizontally guides the movement of a pickup that reads recorded information from an information recording surface of the disk.

  Conventionally, when this type of disc reproducing apparatus scans the recording surface of the disc with the light irradiated from the objective lens of the pickup, the optical axis of the objective lens is set perpendicular to the recording surface of the disc in the radial direction of the disc. The pickup must be moved. For this reason, on the chassis as a reproduction base, a motor for driving the turntable and guide members for guiding a pickup for reading recorded information from the information recording surface of the disk in the radial direction of the disk are located on both the left and right sides of the pickup. One guide member is a moving member that moves the pickup, the other guide member is a pickup feed base member that adjusts the height relative to the chassis, and the optical axis of the objective lens provided on the pickup is The horizontal movement is possible by always being perpendicular to the recording surface (see, for example, Patent Document 1).

JP 2001-093161 A ([0011], FIG. 1)

  Since the conventional disk reproducing apparatus is configured as described above, in order to adjust the optical axis of the objective lens to be perpendicular to the recording surface of the disk, the entire pickup feed base member that guides the pickup horizontally, It must be moved up and down with respect to the chassis to adjust the height. For this reason, it is necessary to widely arrange the support member for supporting the pickup feed base member around the pickup feed base member, and there is a problem that the planar dimension and the thickness dimension for adjusting the tilt angle of the pickup feed base member are increased. there were. Also, when adjusting the tilt angle, it is necessary to adjust the vertical movement and tilt angle while holding the pickup feed base member that guides the pickup in the radial direction of the disk, which requires a precise and large adjusting device. .

  The present invention has been made to solve the above-mentioned problems, and the tilt angle adjustment of the pickup feed base member that guides the movement of the pickup horizontally can be performed with high accuracy by a simple operation without using a large adjusting device. It is an object of the present invention to obtain a disc reproducing apparatus that can be used in the following manner.

  The disc reproducing apparatus according to the present invention has a pickup that reads the recorded information by moving in the radial direction of the disc facing the disc surface placed on the turntable, and a movement that moves the pickup in the radial direction. And a pickup feed base member that horizontally guides the movement of the pickup, and a biasing member that biases the pickup feed base member in one direction. The two points of the fixed height reference point and the first height adjustment point are provided on one end side of the pickup feed base member, and the second height adjustment point is the pickup feed base member. It is provided on the other end side.

  According to the present invention, the pickup feed base member is supported on the reproduction base at three points, and two points of the fixed height reference point and the first height adjustment point are provided on one end side of the pickup feed base member, Since one point of the second height adjustment point is provided on the other end side of the pickup feed base member, the height can be increased by an extremely simple operation only by adjusting the first and second height adjustment points. There is an effect that the inclination angle of the pickup feed base member can be adjusted accurately. Further, the pickup feed base member does not require a large support area with respect to the reproduction base, and there is an effect that the disk reproduction apparatus can be made small and simple.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is a perspective view of the reproducing unit according to the first embodiment as viewed from above, FIG. 2 is a perspective view of the reproducing unit as viewed from below, and FIG. 3 is a perspective view partially exploded in FIG. 4 is a front view of the pickup feed base member, FIG. 5 is a cross-sectional view taken along line aa in FIG. 2, and FIG. 6 is a cross-sectional view taken along line bb in FIG.

1 to 6, a pickup base 3, a disk motor 5 that drives a turntable 5 a, a feed screw shaft 2 that guides the reciprocation of the pickup 3, a pickup feed base member 4, and the pickup 3 are moved to the reproduction base 1. A drive motor M and the like are included.
The reproduction base 1 is formed into a substantially rectangular shape, for example, by press molding of a metal plate, and has a window 1b as a space for accommodating and moving the pickup 3 at the center of the flat surface portion 1a, and a part of the flat surface portion 1a. The periphery has a bent portion 1c bent substantially at a right angle. The reproduction base 1 is fixed in a housing of a disk reproduction apparatus (not shown).

  The pickup 3 has an objective lens 3b at the center of a substantially square frame 3a, and two bearing portions 3c and 3c are projected in parallel on one side, and a bearing portion 3d is projected on the other side. Has been. The pickup 3 is disposed in the window 1b of the reproduction base 1, and is supported by a feed screw shaft 2 and a pickup feed base member 4 provided in parallel on both sides of the window 1b. In the illustrated example, a bearing portion 3d protruding on the other side of the pickup 3 is brought into contact with the pickup feed base member 4, and the feed screw shaft 2 is engaged with holes 3c1 and 3c1 of the bearing portions 3c and 3c protruding on one side. Go through. Further, both ends of the feed screw shaft 2 are rotatably supported by bearings 1d of the reproduction base 1.

  The disk motor 5 is fixed to the reproduction base by screwing screws 52 passed through holes 51 provided at three locations around the substrate 5b into three screw holes 21 provided at one end of the reproduction base 1. A turntable 5 a is attached to the rotating shaft of the motor 5. A drive motor M is provided on the other end side of the playback base 1 with the window 1b interposed therebetween, and the feed screw shaft 2 is driven to rotate through a power transmission gear train (not shown).

  The pickup feed base member 4 is supported by the reproduction base 1 at three points, one of which is a fixed height reference point P1, and the other two points are first and second height adjustment points P2 and P3. . The reference point P1 is the contact point between the protrusion 81 and the substrate 5b, the first height adjustment point P2 is the contact point between the height adjustment screw 22 and the pickup feed base member 4, and the second height adjustment point P3 is high. This is the screwing point of the regeneration base 1 of the height adjusting screw 23, but in the illustrated example, a reference numeral is attached to the extension line of each point for easy viewing. In this case, a first height adjustment point P2 is provided on a line that passes through the fixed reference point P1 and is orthogonal to the pickup guide axis X, and passes through the reference point P1 and is parallel to the pickup guide axis X. A second height adjustment point P3 is provided.

  Between the reproduction base 1 and the pickup feed base member 4, as shown in FIGS. 5 and 6, positions corresponding to the fixed reference point P1 and the first and second height adjustment points P2 and P3. Further, biasing members 44, 45, 46 such as compression coil springs are interposed. Then, one end side is screwed into the screw hole 21 of the reproduction base 1 by inserting a screw through hole 51 formed in the substrate 5b of the disk motor 5 and a mounting screw 52 passed through the screw through hole 41 formed in the pickup feed base member 4. The other end side is supported by screwing a through screw 23 into a screw hole 26 of the reproduction base 1 through a screw through hole 42 of the pickup feed base member 4.

  The urging members 44 and 45 are provided so as not to be displaced by the convex portions 1 e and 1 e formed on the flat surface of the reproduction base 1, and the compression coil spring 46 stands on the flat surface of the reproduction base 1. The pins 1f are provided so as not to be displaced. For this reason, the pickup feed base member 4 is biased in the push-up direction by the compression coil springs 44, 45, 46.

Next, the operation will be described.
When the drive motor M is driven in a state where the disk placed on the turntable 5a is latched by the latching claw 61 protruding on the turntable, the pickup 3 is picked up by the rotation of the feed screw shaft 2 and the pickup feed base member 4 is driven. The disk is moved in the radial direction (radial direction) of the disk using the upper surface of the disk as a horizontal guide.

In this case, the inclination of the pickup 3 with respect to the disk described on the turntable 5a, that is, the height in the pickup focus direction, is the bearings 3c, 3c that engage with the feed screw shaft 2 and the bearing portion that abuts on the pickup feed base member 4. It is defined by 3 points of 3d.
Here, the radial inclination of the pickup 3 is defined by the height difference of the support arms 3 c and 3 c, and the tangential inclination is defined by the height difference of the bearing portion 3 d with respect to the feed screw shaft 2.

  As shown in FIG. 3, the pick-up feed base member 4 is integrally provided with a protrusion 81 serving as a height reference point P1, and the protrusion 81 is a disk by a compression coil spring 44 provided on the back side thereof. A reference point P1 that is urged and abutted against the substrate 5b of the motor 5 to fix the height is determined. The substrate 5b of the disk motor 5 is provided with a tap portion 5c, and the tip end portion 22a of the screw 22 screwed on the tap portion 5a comes into contact with the pickup feed base member 4 to define the height of the first adjustment point P2. Similarly, a biasing member 46 is also arranged at the end of the pickup feed base member 4 on the side opposite to the screw 22 and biases the pickup feed base member 4 in the out-of-plane direction. The adjustment screw 23 is screwed into the screw hole 26 of the reproduction base 1 through the screw through hole 42 of the pickup feed base member 4, and the pickup head base member 4 regulates the displacement of the pickup feed base member 4 in the out-of-plane direction. The height of the second adjustment point P3 of the feed base member 4 is defined.

  The above three points P1, P2, and P3 are arranged at the positions shown in FIG. Therefore, by adjusting the height of the first adjustment point P2, the pickup feed base member 4 rotates about the axis connecting the reference point P1 and the second adjustment point P3. As a result, the height of the pickup guide axis portion X with which the bearing portion 3d of the pickup 3 abuts changes, and the inclination of the pickup 3 in the tangential direction is adjusted.

  Next, by adjusting the height of the second adjustment point P3, the pickup feed base member 4 rotates around the axis connecting the reference point P1 and the first adjustment point P2. As a result, the radial inclination of the pickup guide axial part X with which the bearing 3d of the pickup 3 abuts changes, so that the inclination of the pickup 3 relative to the disk plane does not change even when the pickup 3 slides in the disk radial direction. The pickup feed member 4 can be positioned and adjusted parallel to the feed screw shaft 2.

  As described above, according to the first embodiment, the pickup feed base member 4 is supported on the reproduction base 1 at three points, one point is set as a fixed height reference point P1, and the other two points are set as the first, Since the second height adjustment points P2 and P3 are configured, the height of the pickup guide axis portion X in the pickup focus direction can be adjusted only by adjusting the heights of the first and second height adjustment points P2 and P3. There is an effect that the inclination in the pickup radial direction can be easily adjusted by a small and simple operation without using a large adjusting device.

Embodiment 2. FIG.
FIG. 7 is a plan view of the pickup feed base member 4 according to the second embodiment. The first height adjustment point P2 for supporting the pickup feed base member 4 on the reproduction base 1 is on the pickup guide axis X. This is a configuration provided. According to the configuration of the second embodiment, by adjusting the height at the first height adjustment point P2, one end of the pickup guide axis X is directly adjusted and fixed. As a result, there is an effect that after the adjustment, the positional deviation is less likely to occur due to a disturbance such as vibration that the pickup guide axis X receives from the outside.

Embodiment 3 FIG.
FIG. 8 is an exploded perspective view of a part of the reproducing unit showing the third embodiment, and FIG. 9 is a cross-sectional view of the main part thereof, which is the same as the first embodiment shown in FIGS. Are denoted by the same reference numerals, and redundant description is omitted. In the third embodiment, the urging directions of the fixed reference point P1 and the first height adjustment point P2 are the same direction, and the urging member 47 is provided at a substantially intermediate position between the two points. According to the configuration of the third embodiment, two urgings can be performed by one urging member 47. As a result, the number of urging members used can be reduced as compared with the first and second embodiments, and the structure can be simplified and the cost can be reduced.

FIG. 3 is a perspective view of the reproducing unit according to Embodiment 1 as viewed from above. FIG. 3 is a perspective view of the reproducing unit according to the first embodiment when viewed from the bottom surface. FIG. 3 is a perspective view partially exploded in FIG. 2. It is a front view of a pickup feed base member. FIG. 3 is a transverse sectional view taken along the line aa in FIG. 2. It is a cross-sectional view which follows the bb line of FIG. FIG. 10 is a plan view of a pickup feed base member in the second embodiment. FIG. 10 is an exploded perspective view illustrating a part of a reproducing unit according to a third embodiment. It is a cross-sectional view of the main part of FIG.

Explanation of symbols

1 reproduction base, 2 feed screw shaft, 3 pickup, 4 pickup feed base member, 5 disc motor, 5a turntable, 22, 23 height adjusting screw, 44, 45, 46 urging member (compression coil spring), P1 height Fixed reference points, P2, P3 First and second height adjustment points.

Claims (4)

  A reproduction base having a motor for driving the turntable; a pickup that moves in a radial direction of a disk placed on the turntable and reads out recorded information from an information recording surface of the disk; and In the disk reproducing apparatus, comprising: a moving means for moving the pickup in a direction; a pickup feed base member for horizontally guiding the movement of the pickup; and a biasing member for biasing the pickup feed base member in one direction. A member is supported on the reproduction base at three points, and two points, a reference point for fixing the height and a first height adjustment point, are provided on one end side of the pickup feed base member, and a second height adjustment point is provided. One point is a disc reproducing apparatus provided on the other end side of the pickup feed base member.   A first height adjustment point is provided on a line passing through a fixed height reference point and orthogonal to the pickup guide axis, and a second height is set on a line passing through the fixed height reference point and parallel to the pickup guide axis. 2. The disk reproducing apparatus according to claim 1, further comprising an adjustment point.   A first height adjustment point is provided at an intersection with the pickup guide axis on a line orthogonal to the pickup guide axis through a fixed height reference point, and passes through the fixed height reference point, and the pickup guide axis 2. The disk reproducing apparatus according to claim 1, wherein a second height adjustment point is provided on the parallel line. The urging direction of the pickup feed base member at the fixed height reference point and the first height adjustment point is the same direction, and is at a substantially intermediate position between the fixed height reference point and the first height adjustment point. 4. The disk reproducing apparatus according to claim 2, further comprising an urging member for the pickup feed base member.

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